1935-01-01

The Lubrication Requirements of Automotive Worm Gearing 350093

THE characteristics of automotive worm gearing have been investigated through the use of a special dynamometer installation capable of testing standard passenger-car and bus axles. The equipment employed in the measurement of the efficiency and of maximum permissible torque attainable with various lubricants has been described.
A complete study of the effect of lubricants upon gear performance requires measurement of the rate of wheel-tooth wear, the amount and nature of corrosion, and the extent of lubricant oxidation and polymerization, as well as investigation of the rate of wheel pitting. Researches carried out for the purpose of studying the mechanism of tooth fatigue are described, and the results of the study reported.
The conclusion is reached that no single lubricant possesses all of the characteristics desired in worm-gear lubrication. It has been found that the product which proves to be the most suitable for one class of service has serious objections when employed under other conditions of operation. The suggestion is made that information relative to lubricant characteristics and the conditions of service to which they are to be subjected be secured before final selection of lubricant is made.

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